:root {
  /* Premium Color System */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  --color-cream-50: rgba(252, 252, 249, 1);
  --color-cream-100: rgba(255, 255, 253, 1);
  --color-gray-200: rgba(245, 245, 245, 1);
  --color-gray-300: rgba(167, 169, 169, 1);
  --color-gray-400: rgba(119, 124, 124, 1);
  --color-slate-500: rgba(98, 108, 113, 1);
  --color-brown-600: rgba(94, 82, 64, 1);
  --color-charcoal-700: rgba(31, 33, 33, 1);
  --color-charcoal-800: rgba(38, 40, 40, 1);
  --color-slate-900: rgba(19, 52, 59, 1);
  --color-teal-300: rgba(50, 184, 198, 1);
  --color-teal-400: rgba(45, 166, 178, 1);
  --color-teal-500: rgba(33, 128, 141, 1);
  --color-teal-600: rgba(29, 116, 128, 1);
  --color-teal-700: rgba(26, 104, 115, 1);
  --color-teal-800: rgba(41, 150, 161, 1);
  --color-red-400: rgba(255, 84, 89, 1);
  --color-red-500: rgba(192, 21, 47, 1);
  --color-orange-400: rgba(230, 129, 97, 1);
  --color-orange-500: rgba(168, 75, 47, 1);

  /* Semantic Colors */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-charcoal-800);
  --color-text-light: var(--color-slate-500);
  --color-primary: var(--color-teal-600);
  --color-primary-hover: var(--color-teal-700);
  --color-secondary: var(--color-brown-600);
  --color-accent: var(--color-orange-500);
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: var(--color-red-500);
  --color-border: rgba(0, 0, 0, 0.08);

  /* Premium Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-teal-600) 0%, var(--color-teal-800) 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-orange-400) 0%, var(--color-orange-500) 100%);
  --gradient-surface: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(248, 250, 252, 0.8) 100%);
  --gradient-hero: radial-gradient(ellipse at center top, rgba(33, 128, 141, 0.1) 0%, transparent 50%);

  /* Advanced Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);

  /* Refined Typography */
  --font-display: 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-body: 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

  /* Spacing Scale */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.125rem;
  --radius-base: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --radius-full: 9999px;

  /* Animation Timing */
  --timing-fast: 150ms;
  --timing-base: 200ms;
  --timing-slow: 300ms;
  --timing-slower: 500ms;

  /* Ease Functions */
  --ease-linear: linear;
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Import Premium Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100;200;300;400;500;600;700;800;900&display=swap');

/* Base Reset & Globals */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  font-weight: 400;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Enhanced Container System */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

@media (max-width: 640px) {
  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
}

/* Utility Classes */
.active {
  display: block !important;
}

.inactive,
.auth-container:not(.active),
.verification-container:not(.active),
.subscription-container:not(.active),
.platform-container:not(.active) {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================= */
/* AUTHENTICATION SECTION - PREMIUM DESIGN */
/* ========================================= */

.auth-section {
  min-height: 100vh;
  background: linear-gradient(135deg, 
    var(--color-teal-600) 0%, 
    var(--color-teal-800) 35%,
    var(--color-slate-900) 100%);
  position: relative;
  overflow: hidden;
}

.auth-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(50, 184, 198, 0.15) 0%, transparent 50%);
  animation: float-background 20s ease-in-out infinite alternate;
}

@keyframes float-background {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-20px, -10px) scale(1.05); }
}

.auth-container {
  position: relative;
  z-index: 10;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
}

/* Premium Auth Card */
.auth-card {
  width: 100%;
  max-width: 480px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-3xl);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
  position: relative;
}

.auth-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.8) 50%, 
    transparent 100%);
}

/* Enhanced Auth Header */
.auth-header {
  padding: var(--space-12) var(--space-8) var(--space-8);
  text-align: center;
  background: linear-gradient(145deg, 
    rgba(255, 255, 255, 0.1) 0%, 
    rgba(255, 255, 255, 0.05) 100%);
  position: relative;
}

.logo-large {
  margin-bottom: var(--space-6);
}

.logo-large h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-teal-700);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.tagline {
  font-size: 0.95rem;
  color: var(--color-slate-500);
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* Premium Tab System */
.auth-tabs {
  display: flex;
  margin: 0 var(--space-8) var(--space-8);
  background: var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-1);
  box-shadow: var(--shadow-inner);
}

.auth-tab {
  flex: 1;
  padding: var(--space-3) var(--space-6);
  border: none;
  background: transparent;
  color: var(--color-slate-500);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: calc(var(--radius-xl) - var(--space-1));
  cursor: pointer;
  transition: all var(--timing-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.auth-tab::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-white);
  border-radius: calc(var(--radius-xl) - var(--space-1));
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transform: scale(0.95);
  transition: all var(--timing-base) var(--ease-out);
  z-index: -1;
}

.auth-tab.active::before {
  opacity: 1;
  transform: scale(1);
}

.auth-tab.active {
  color: var(--color-teal-700);
}

/* Enhanced Form System */
.auth-form {
  display: none;
  padding: 0 var(--space-8) var(--space-8);
  animation: fadeInUp var(--timing-slow) var(--ease-out);
}

.auth-form.active {
  display: block;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-charcoal-700);
  letter-spacing: 0.01em;
}

.form-control {
  width: 100%;
  padding: var(--space-4) var(--space-5);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-white);
  transition: all var(--timing-base) var(--ease-out);
  box-shadow: var(--shadow-xs);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-teal-500);
  box-shadow: 0 0 0 3px rgba(33, 128, 141, 0.1), var(--shadow-sm);
  transform: translateY(-1px);
}

.form-control::placeholder {
  color: var(--color-gray-400);
  font-weight: 400;
}

/* Premium Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  border: none;
  border-radius: var(--radius-xl);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--timing-base) var(--ease-out);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  min-height: 48px;
  box-shadow: var(--shadow-sm);
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.2) 50%, 
    transparent 100%);
  transition: left var(--timing-slower) var(--ease-out);
}

.btn:hover::before {
  left: 100%;
}

.btn--primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn--secondary {
  background: var(--color-white);
  color: var(--color-teal-600);
  border: 1.5px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-gray-200);
  transform: translateY(-1px);
}

.btn--full-width {
  width: 100%;
}

.btn--lg {
  padding: var(--space-5) var(--space-8);
  font-size: 1.1rem;
  min-height: 56px;
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: 0.9rem;
  min-height: 36px;
}

/* Auth Links */
.auth-links {
  margin-top: var(--space-6);
  text-align: center;
}

.auth-link {
  color: var(--color-teal-600);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: color var(--timing-base) var(--ease-out);
}

.auth-link:hover {
  color: var(--color-teal-700);
  text-decoration: underline;
}

/* ======================================= */
/* PLATFORM SECTION - PREMIUM DASHBOARD */
/* ======================================= */

.platform-section {
  min-height: 100vh;
  background: var(--color-background);
  position: relative;
}

/* Premium Navigation */
.platform-nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(20px);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 var(--space-6);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.brand-logo {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: var(--shadow-md);
}

.brand-text h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-teal-700);
  line-height: 1;
  margin: 0;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--color-slate-500);
  font-weight: 500;
  margin: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-item {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-lg);
  color: var(--color-slate-500);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all var(--timing-base) var(--ease-out);
  border: none;
  background: transparent;
  cursor: pointer;
}

.nav-item:hover,
.nav-item.active {
  background: var(--color-teal-600);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.nav-user {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.user-badge {
  padding: var(--space-1) var(--space-3);
  background: var(--gradient-accent);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.user-name {
  font-weight: 600;
  color: var(--color-text);
}

/* Premium Content Area */
.platform-content {
  padding: var(--space-8) 0;
  min-height: calc(100vh - 72px);
}

.page {
  display: none;
  animation: fadeInSlide var(--timing-slow) var(--ease-out);
}

.page.active {
  display: block;
}

@keyframes fadeInSlide {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Enhanced Hero Section */
.hero-section {
  background: var(--gradient-hero);
  padding: var(--space-24) 0 var(--space-20);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="rgba(33,128,141,0.1)"/></svg>') 0 0/50px 50px;
  animation: drift 60s linear infinite;
}

@keyframes drift {
  0% { transform: translateX(0) translateY(0); }
  100% { transform: translateX(-50px) translateY(-50px); }
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  color: var(--color-teal-800);
  line-height: 1.1;
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-slate-500);
  margin-bottom: var(--space-10);
  font-weight: 500;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* Premium Card System */
.card-grid {
  display: grid;
  gap: var(--space-6);
  margin-bottom: var(--space-12);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

.card {
  background: var(--gradient-surface);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--color-border);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: all var(--timing-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--timing-base) var(--ease-out);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card:hover::before {
  opacity: 1;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}

.card-badge {
  padding: var(--space-1) var(--space-2);
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
  border-radius: var(--radius-base);
  font-size: 0.75rem;
  font-weight: 600;
}

.card-content {
  color: var(--color-text-light);
  line-height: 1.6;
}

.card-metric {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--color-teal-700);
  line-height: 1;
  margin: var(--space-4) 0 var(--space-2);
}

.card-subtitle {
  font-size: 0.9rem;
  color: var(--color-slate-500);
  font-weight: 500;
}

/* Section Headers */
.section-header {
  margin-bottom: var(--space-10);
  text-align: center;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-light);
  font-weight: 500;
  max-width: 600px;
  margin: 0 auto;
}

/* Enhanced Features List */
.features-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2);
}

.feature-icon {
  width: 20px;
  height: 20px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.feature-text {
  color: var(--color-text);
  font-weight: 500;
}

/* Modal System */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-4);
}

.modal-content {
  background: var(--color-white);
  border-radius: var(--radius-3xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-2xl);
  border: 1px solid var(--color-border);
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .card {
    padding: var(--space-4);
  }

  .auth-card {
    margin: var(--space-4);
  }

  .auth-header {
    padding: var(--space-8) var(--space-6) var(--space-6);
  }

  .auth-form {
    padding: 0 var(--space-6) var(--space-6);
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }

  .hero-title {
    font-size: 2rem;
  }

  .card-metric {
    font-size: 2rem;
  }

  .nav-container {
    padding: 0 var(--space-4);
  }
}

/* Performance Optimizations */
* {
  will-change: auto;
}

.btn,
.card,
.nav-item,
.form-control {
  will-change: transform;
}

/* Focus Management for Accessibility */
.btn:focus,
.form-control:focus,
.nav-item:focus,
.auth-tab:focus {
  outline: 2px solid var(--color-teal-500);
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  .platform-nav,
  .nav-user,
  .hero-actions {
    display: none;
  }

  .card {
    box-shadow: none;
    border: 1px solid var(--color-border);
  }
}